grouper_example4.py

import plotly.graph_objects as go
import plotly_express as px

# group the dataframe
group = df.groupby('types')

# create a blank canvas
fig = go.Figure()

# each group iteration returns a tuple
# (group name, dataframe)
for group_name, df in group:
    fig.add_trace(
        go.Scatter(
              x=df['dates']
            , y=df['count']
            , fill='tozeroy'
        ))